In the affected vehicles, the bolts that secure the housing for the variable camshaft timing adjustment (VANOS) unit can loosen over time and may possibly break.

Consequence:
If the bolts loosen or break the engine may have reduced power or stall. An engine stall increases the risk of a crash.

Remedy:
BMW will notify owners, and dealers will replace the four VANOS housing bolts for both VANOS units (intake and exhaust), free of charge. The recall is expected to begin in May 2014.

In addition, owners of approximately 170,172 model year 2010-2012 BMW vehicles equipped with inline 6 cylinder engines not covered by this recall, will receive an extended warranty to address this condition. Owners may contact BMW at 1-800-525-7417.

Customers may contact the National Highway Traffic Safety Administration's vehicle safety hotline at 1-888-327-4236 (tty: 1-800-424-9153); or go to Safercar.

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